You will have to read the end credits for each episode to find out who actually animates the episodes. There are FAR too many to list here and most likely the names would be unknown to you so naming them would almost be pointless.
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Anime is Japanese animation such as Pokemon, digimon etc...and is mostly to entertain just like the simpsons or family guy or whatever
Season 4|Episode 5 The Cleveland Loretta Quagmireand then again as 'Irag Lobster' in Season 10|Episode 4 Screams of Silence: The Story of Brenda Q
Actual Disney animators did that scene. If you're asking for specific names, that information is unknown.
No such character exists on Family Guy
The simpsons is made with traditional 2D drawn animation but in some modern episodes 3d animations are used.